EP0780749B1 - Method of controlling a third-to-first speed skip shift - Google Patents

Method of controlling a third-to-first speed skip shift Download PDF

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Publication number
EP0780749B1
EP0780749B1 EP96120539A EP96120539A EP0780749B1 EP 0780749 B1 EP0780749 B1 EP 0780749B1 EP 96120539 A EP96120539 A EP 96120539A EP 96120539 A EP96120539 A EP 96120539A EP 0780749 B1 EP0780749 B1 EP 0780749B1
Authority
EP
European Patent Office
Prior art keywords
speed
shift
transmission
controlling
running
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP96120539A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0780749A2 (en
EP0780749A3 (en
Inventor
Hee-Yong Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hyundai Motor Co
Original Assignee
Hyundai Motor Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hyundai Motor Co filed Critical Hyundai Motor Co
Publication of EP0780749A2 publication Critical patent/EP0780749A2/en
Publication of EP0780749A3 publication Critical patent/EP0780749A3/en
Application granted granted Critical
Publication of EP0780749B1 publication Critical patent/EP0780749B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H61/06—Smoothing ratio shift by controlling rate of change of fluid pressure
    • F16H61/061—Smoothing ratio shift by controlling rate of change of fluid pressure using electric control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/38—Inputs being a function of speed of gearing elements
    • F16H2059/385—Turbine speed
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/04—Smoothing ratio shift
    • F16H2061/0444—Smoothing ratio shift during fast shifting over two gearsteps, e.g. jumping from fourth to second gear
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/14—Inputs being a function of torque or torque demand
    • F16H59/24—Inputs being a function of torque or torque demand dependent on the throttle opening
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
    • F16H59/36—Inputs being a function of speed
    • F16H59/38—Inputs being a function of speed of gearing elements
    • F16H59/40—Output shaft speed

Definitions

  • the present invention relates to a method of controlling a third-to-first speed skip shift, and more particularly, to a method providing an improved responsiveness to a third-to-first speed skip shift by controlling a hydraulic pressure for controlling an operation of a front clutch of an exhaust side.
  • a driver can automatically operate the transmission gear at a target transmission position by controlling a hydraulic pressure within the transmission range to be set by the running speed of a vehicle.
  • the automatic transmission for a vehicle requires a minimum amount of effort on the part of the driver, removing the necessity for a driver to work a clutch pedal. Also, the automatic transmission makes driving easy since there is little possibility of an engine being stalled due to a driving mistake or an unskilled driving technique.
  • the conventional transmission controls a rotary power of the fluid by operating a torque converter in accordance with the output power of an engine, and feeds the hydraulic pressure to a corresponding valve according to the control signal applied in a transmission control system.
  • a plurality of ports are changed in accordance with the transmission lever selected by a driver, the hydraulic pressure from an oil pump is fed to the automatic transmission and the operation of hydraulic pressure valve is changed according to the hydraulic pressure.
  • the automatic transmission controls the operation of the hydraulic pressure for controlling the operation of friction members.
  • the operation of a planetary gear is variable according to the selective operation of the friction members comprising clutches and a brake, and a drive gear is operated at a set transmission ratio.
  • the transmission ratio is fed to a first driven gear engaged a final reduction gear via a second driven gear engaged the drive gear.
  • the automatic transmission can automatically change speeds in accordance with the running state of a vehicle, the necessity for reducing the shift shock generated due to the repetitive operation of the friction members to be stopped and begins to be operated arises. It is possible to minimize the shift shock by the variable duty ratio for the hydraulic pressure control solenoid valve according to the respective state of the transmission.
  • the conventional transmission does not control the hydraulic pressure for the purpose of reducing the shift shock at the third-to-first speed skip shift. Therefore, a driver using the conventional transmission in a state of the third-to-first speed skip shift faces a great shift shock since the operation of the front clutch which has been operated at a third speed is stopped thereby hydraulic pressure has been fed to the front clutch is abruptly exhausted.
  • EP 0 678 609 A1 is concerned with hydraulic control system of a 4-speed automatic transmission for vehicles and described the operation of the several friction elements used for realizing different speeds of the drive "D" renge. In particular, it is described which elements of the hydraulic control system have to be actuated to control the several friction elements.
  • EP 0 529 177 A1 described a continuously variable transmission down shift control strategy to minimize slip at the drive pulley.
  • the transmission to be controlled comprises an input V-shaped pulley and an output V-shaped pulley connected by a chain-belt.
  • each of the pulleys has a movable sheave so that the effective diameters of the pulleys can be continuously changed so as to continuously varying the transmission ratio. Since the transmission ratio of this transmission can be continuously changed, there exists no specific speed stage. Consequently, the speed shift control has to be performed in a way that is completely different from that of performing speed shift in an automatic transmission comprising specific speed stages as realized by a planetary gear unit.
  • Claim 2 describes a favorable refinement of the invention.
  • Fig. 1 is a block diagram for a control system having an improved responsiveness to a third-to-first speed skip shift according to the embodiment of the present invention.
  • Fig. 2 is a flow chart illustrating the method for determining whether or not the automatic transmission is in a third-to-first speed skip shift according to the embodiment of the present invention.
  • Fig. 3A illustrates the state of the transmission position according to the embodiment of the present invention.
  • Fig. 3B illustrates the pattern of the duty ratio for the hydraulic pressure according to the embodiment of the present invention.
  • Fig.3C illustrates the graph showing the variable rpm of an output shaft according to the embodiment of the present invention.
  • present invention comprises,
  • the transmission control unit 2 determines whether or not the command of a second-to-first speed is applied after the command of a third-to-second speed shift S11. If the command for the second-to-first speed shift is not applied in step S11, the transmission control unit 2 determines whether a vehicle is running at an acceleration speed or at a deceleration speed.
  • the transmission control unit 2 controls the opening of the throttle valve by reading the output signal from the sensor for an opening of a throttle valve 13, and determines whether or not the change of the opening of a throttle valve according to time exceeds 30v/sec and the opening of the throttle checked exceeds 3.5v S12.
  • the transmission control unit 2 determines that a vehicle is running at an acceleration speed after a momentary deceleration speed. The transmission control unit 2 determines whether or not a transmission is in the third-to-first speed shift.
  • the transmission control unit 2 controls the third-to-second speed shift S13 and determines whether or not the command signal for a second-to-first speed shift is applied during the operation of the third-to-second speed shift S14.
  • the transmission control unit 2 controls a third-to-second speed shift and then a second-to-first speed shift determining the present transmission as being in the state of a third-to-second-to-first speed shift S100.
  • the transmission control unit 2 determines whether or not the RPM of the output shaft satisfies the conditions, 300rpm ⁇ output shaft RPM ⁇ 900rpm S15 by reading the output signal from the sensor for the number of an output shaft rotation.
  • the transmission control unit 2 controls the third-to-second speed shift S300.
  • the transmission control unit 2 determines whether or not the opening of the throttle valve exceeds 1.25v and the number of the engine rotation exceeds 1800rpm S16 by reading the output signal from the sensor for an opening of the throttle valve 13 and the output signal from the sensor for the number of an engine rotation 11. Then, the transmission control unit 2 compares the determined number of the engine rotation and the determined opening of the throttle valve with the running conditions necessary for the third-to-first speed skip shift.
  • the transmission control unit 2 determines the current transmission as being in the state of third-to-first speed skip shift and controls the duty ratio of the hydraulic pressure for stopping the front clutch in order to reduce the shift shock generated due to the skip shift S200.
  • the transmission control unit 2 controls the third-to-second shift S300.
  • the transmission control unit 2 controls the third-to-first skip shift.
  • the transmission control unit 2 stops the end clutch which is operating at the third speed by controlling the transmission in the state of a second speed for a predetermined time.
  • the front clutch operating at a third speed is still operating due to the mechanical construction of the automatic transmission when the transmission control unit(2) is in the state of a second speed.
  • the transmission control unit 2 increases the duty ratio of the control signal for controlling the operation of the hydraulic pressure control solenoid valve 3 to the point C1, and then increases the duty ratio at a gradient ⁇ 1 to the point at which the transmission begins. At this time, the transmission control unit 2 controls a second-to-third speed shift.
  • the transmission control unit 2 increases gradually the duty ratio at a gradient ⁇ 2 after decreasing the duty ratio to a point C2 in a "C" section.
  • the hydraulic pressure control solenoid valve 3 is operated so as to change the automatic transmission in the state of a third speed to be in the state of a second speed.
  • the transmission control unit 2 increases gradually the duty ratio at a gradient ⁇ 3 after decreasing the duty ratio to a point C3 in a "D" section, thereby the automatic transmission is operating at a first speed.
  • the number of a turbine shaft rotation is increased to that of the first speed.
  • the transmission control unit 2 increases the duty ratio at a gradient ⁇ 3 for a predetermined time. As a result, a vehicle is running at the first speed.
  • the section in which a vehicle is running at the first speed is provided for the necessary time for changing the operation of the automatic transmission to that in the complete first speed.
  • the transmission control unit 2 changes the transmission position to that in the first speed.
  • the present invention prevents the shift shock during the third-to-first speed skip shift from being generated due to a sudden torque conversion, allowing the automatic transmission to be in a gradual third-to-second speed shift, then a gradual second-to-first speed shift.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Control Of Transmission Device (AREA)
EP96120539A 1995-12-21 1996-12-19 Method of controlling a third-to-first speed skip shift Expired - Lifetime EP0780749B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR9553496 1995-12-21
KR1019950053496A KR100264562B1 (ko) 1995-12-21 1995-12-21 3→1속 스킵 변속시 변속감 향상 제어 장치

Publications (3)

Publication Number Publication Date
EP0780749A2 EP0780749A2 (en) 1997-06-25
EP0780749A3 EP0780749A3 (en) 1998-06-10
EP0780749B1 true EP0780749B1 (en) 2002-03-27

Family

ID=19442406

Family Applications (1)

Application Number Title Priority Date Filing Date
EP96120539A Expired - Lifetime EP0780749B1 (en) 1995-12-21 1996-12-19 Method of controlling a third-to-first speed skip shift

Country Status (6)

Country Link
US (1) US5863276A (ja)
EP (1) EP0780749B1 (ja)
JP (1) JP3116216B2 (ja)
KR (1) KR100264562B1 (ja)
AU (1) AU701774B2 (ja)
DE (1) DE69620123T2 (ja)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970046586A (ko) * 1995-12-30 1997-07-26 전성원 자동 변속기의 다운 시프트 제어 장치 및 그 방법
DE69729812T2 (de) * 1996-09-25 2005-02-03 Honda Giken Kogyo K.K. Steuergerät für hydraulisch gesteuertes Fahrzeuggetriebe
KR100316916B1 (ko) * 1999-06-24 2001-12-24 이계안 차량용 자동 변속기의 변속 제어 방법
KR100357584B1 (ko) * 2000-10-30 2002-10-19 현대자동차주식회사 5단 자동변속기의 킥다운 변속 응답 개선방법
JP3838422B2 (ja) * 2000-12-06 2006-10-25 現代自動車株式会社 車両用自動変速機の変速制御装置およびその方法
WO2003029699A1 (fr) * 2001-09-28 2003-04-10 Jatco Ltd Dispositif de commande de changement de vitesse pour boite de vitesses automatique
KR100489094B1 (ko) * 2002-12-05 2005-05-12 현대자동차주식회사 6속 자동 변속기의 변속 경로 제어 방법
KR100579250B1 (ko) * 2003-11-17 2006-05-11 현대자동차주식회사 스태틱 변속 중 팁인 시 유압 제어방법 및 그 제어장치
JP4690278B2 (ja) * 2006-09-15 2011-06-01 トヨタ自動車株式会社 自動変速機の変速制御装置
KR100903322B1 (ko) * 2007-11-02 2009-06-16 현대자동차주식회사 자동변속기의 변속 제어 장치
US8323150B2 (en) * 2010-05-04 2012-12-04 GM Global Technology Operations LLC Quick skip-at-sync control system and method
KR101305842B1 (ko) * 2011-06-09 2013-09-06 기아자동차주식회사 차량의 더블클러치변속기 제어방법
KR101316314B1 (ko) 2011-06-09 2013-10-08 기아자동차주식회사 차량의 ｄｃｔ 제어방법
KR101305852B1 (ko) 2011-06-09 2013-09-06 현대자동차주식회사 차량의 변속기 제어방법
JP5947086B2 (ja) 2012-04-02 2016-07-06 ダイムラー・アクチェンゲゼルシャフトＤａｉｍｌｅｒ ＡＧ 車両の変速制御装置
KR101371479B1 (ko) * 2012-10-08 2014-03-14 현대자동차주식회사 무단변속장치 및 그것의 제어방법

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GB1302081A (ja) * 1969-01-29 1973-01-04
JPS6449745A (en) * 1987-08-21 1989-02-27 Toyota Motor Corp Failure judging device for kick-down switch of automatic transmission
US4905545A (en) * 1988-04-29 1990-03-06 Chrysler Motors Corporation Method of controlling the speed change of a kickdown shift for an electronic automatic transmission system
JP2858348B2 (ja) * 1990-04-10 1999-02-17 アイシン精機株式会社 自動変速機の油圧制御装置
US5168778A (en) * 1991-08-29 1992-12-08 Borg-Warner Automotive, Inc. CVT downshift control strategy to minimize slip at the drive pulley
US5462500A (en) * 1993-05-21 1995-10-31 Chrysler Corporation Automatic transmission with adaptive shift schedule
WO1995000354A1 (en) * 1993-06-22 1995-01-05 Hyundai Motor Company Hydraulic control system for 4-speed automatic transmission
JPH07119814A (ja) * 1993-10-25 1995-05-12 Mitsubishi Motors Corp 自動変速機の変速制御装置
EP0678690B1 (en) * 1994-04-19 1998-06-17 Hyundai Motor Company Hydraulic control system of a 4-speed automatic transmission for vehicle

Also Published As

Publication number Publication date
KR100264562B1 (ko) 2000-09-01
EP0780749A2 (en) 1997-06-25
AU701774B2 (en) 1999-02-04
KR970046664A (ko) 1997-07-26
EP0780749A3 (en) 1998-06-10
DE69620123T2 (de) 2002-10-31
JP3116216B2 (ja) 2000-12-11
AU7542396A (en) 1997-06-26
DE69620123D1 (de) 2002-05-02
US5863276A (en) 1999-01-26
JPH102408A (ja) 1998-01-06

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